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Extron Electronics AVT 200HD User Guide User Manual

Page 109

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AVT 200HD Tuner • Reference Information

103

103

Telnet tips

It is not the intention of this guide to detail all of the operations and functionality of Telnet;
however, some basic level of understanding is necessary for operating the AVT 200HD via
Telnet.

Connecting to the AVT (Open command)

You connect to the AVT Plus tuner using the

Open

command. After your computer is

connected to the tuner, you can enter the SIS commands the same as you would if you were
using the RS-232 link.
Connect to the AVT as follows:

1.

At the Telnet prompt, enter

open

IP

address

.

If the tuner is not password protected, no further prompts are displayed until
you disconnect from the AVT 200HD.

If the tuner is password protected, Telnet displays the password prompt.

2.

If necessary, enter the password at the password prompt.
Connection to the tuner via the Ethernet can be password protected. There are two
levels of password protection: administrator and user.

A person logged on as an administrator has full access to all AVT switching
capabilities and editing functions.

Users can closed captioning on and off, mute or unmute the output, select the
channel or preset, and view all settings with the exception of passwords. By default,
the tuner is delivered with both passwords set to empty.

When you are logged in, the tuner returns either

Login

Administrator

or

Login

User

. No further prompts are displayed until you disconnect from the AVT 200HD.

Escape character and Esc key

Many SIS commands include the keyboard key. Consequently, some confusion may
exist between the

Escape

character and the key.

When Telnet is first started, the utility advises that the

Escape

character

is

Ctrl+]

.”

This means that the Telnet

Escape

character is a key combination: the key and the

<]> key pressed simultaneously. Pressing these keys displays the Telnet prompt while leaving
the connection to the AVT 200HD intact.

Local echo

Once your computer is connected to the AVT 200HD, by default Telnet does not display your
keystrokes on the screen. SIS commands are entered blindly, and only the SIS responses are
displayed on the screen. To command Telnet to show all keystrokes, enter

set

local_echo

at the Telnet prompt before you open the connection to the tuner.
With local echo turned on, keystrokes and the tuner responses are displayed on the same
line.
Example:

1*1!In1

Out1

All

,

where

1*1!

is the SIS command and

In1

Out1

All

is the response.

Note that all keystrokes are displayed, even those that should be masked, such as the
password entry. For example, when entering a password with local echo turned on, you
see a display such as

a*d*m*i*n*

, where

admin

is the keyed-in password and

*****

is the

masked response.
Local echo can be turned off by entering

unset

local_echo

at the Telnet prompt. If your

computer is connected to the AVT 200HD, and you need to access the Telnet prompt to turn
local echo off, enter the

Escape

sequence (

>

).